Core Data predicate : unimplemented SQL generation for predicate

Question

Basically I got 3 entities in my data model : Brand, Model and Trim.

• A brand has a one-to-many relationship with Model called \"models\". (one brand have multi

Answer 1

When you use a predicate in a CoreData operation, the predicate gets translated into SQL. That translation is not possible for all NSPredicate operations, you've hit one that isn't. My suggestion would be something along the lines of:

NSMutableArray* predicates = [NSMutableArray new];
for(NSString* trim in arrayOfTrims)
{
    [predicates addObject:[NSPredicate predicateWithFormat:@"%@ IN models.trims", trim]];
}
NSPredicate*    predicate = [NSCompoundPredicate orPredicateWithSubpredicates:predicates];